I will say only one thing, "don't put all your eggs in one basket", and that way you will reduce the risks arising from long-term investment. I will not tell anyone what to invest in, but be smart and try to understand that no one knows what will happen next year, let alone in 20 years. It's not just about the price of Bitcoin, but also the way in which you will store it to be safe - because it is very easy to lose everything that you have saved in this way for years if you happen to be hacked, or if you somehow lose your backup.
Being your own bank is really a big challenge and responsibility, and those who don't understand how important it is are not ready to invest in Bitcoin.
Came in to say this. I know at least one Bitcoiner's who's gone all in, but he's also forced his family and 3 kids to already live a very alternative lifestyle with home schooling. Respect to anyone who wants to do their own thing, but there are no guarantees, not for fiat guaranteed by the government, not for welfare enshrined by whichever constitution, certainly not for Bitcoin.
And as Lucius said, it's not just about the value of your investment but about the safety, security, and ability for inheritance.
I mentioned in forum personally, given 2 kids their own Bitcoin some years back (I hold the rest for everyone, wary of a time when I must find a way for them to enjoy it in my passing). The older, more responsible one, actually lost his privkeys. An experiment I expected him to pass.
Sovereign money, independence, these all sound great, but the responsibility, the challenge, people probably don't realise the magnitude of that shift of mindset.